import sys


def input(): return sys.stdin.readline().rstrip('\n')


sys.setrecursionlimit(10 ** 6)


def main():
    n = int(input())
    d = [0] * n
    for _ in range(n - 1):
        a, b = map(int, input().split())
        d[a - 1] += 1
        d[b - 1] += 1

    print(sum(max(0, k - 2) for k in d))


if __name__ == '__main__':
    main()